EARPHONE (VERSIONS) Russian patent published in 2004 - IPC

FIELD: earphones with reduced impulse noise.

SUBSTANCE: according to one version, earphone has body including ear insert adapted for hanging between tragus and antitragus of outer ear. Rear part of earphone body serves as cover defining hollow acoustic chamber. Plurality of acoustic apertures are distributed over cover surface. Earphone is further provided with loudspeaker fixed inside hollow acoustic chamber of cover. Loudspeaker has sound exit side faced toward cover and rear part of earphone body. Loudspeaker sound exit side is oriented in direction opposite rear part of ear insert. Supply cable is connected to lower end of earphone body and adapted for supplying of electric current to loudspeaker. According to other version, earphone has body including front part arranged between tragus and antitragus of outer ear. Earphone body has hollow acoustic chamber and plurality of acoustic apertures distributed over earphone front part surface. Loudspeaker is fixed inside hollow acoustic chamber of earphone body. Loudspeaker has sound exit side faced toward rear part of earphone body and rear side faced to front part of earphone body. Sound exit side of loudspeaker is oriented in direction opposite front part of earphone body. Supply cable is connected to lower end of earphone body and adapted for supplying of electric current to loudspeaker. Earphone of such construction protects user from conductive hearing loss and, accordingly, prevents loudspeaker acoustic waves from indirect transmission to tympanic membrane arranged in innermost part of ear tract.

EFFECT: increased efficiency in protecting of middle ear from conductive hearing loss caused by direct air pressure impact.

4 cl, 9 dwg